Anita Pallenberg, the “Performance” actress and longtime girlfriend of Keith Richards, died Tuesday.

Anita Pallenberg, the "Performance" actress and longtime girlfriend of Keith Richards, died Tuesday.

She was 73.

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Stella Schnabel, daughter of painter Julian Schnabel, announced the news on Instagram.

"I have never met a woman quite like you Anita. I don't think there is anybody in this universe like you. No one has ever understood me so well. You showed about life and myself and how to grow and become and exist with it all," she captioned a black-and-white photo of them.

Anita Pallenberg, who had three children with Keith Richards during a long-term relationship, died Tuesday. (McCarthy/Getty Images)

"I was a little girl thinking I was big but I became a woman through knowing you. The secret lyrical you. My best friend.. The greatest woman I have ever known. Thank you for the most important lessons - because they are ever changing and definitive. Like you. We are all singing for you, how you liked it."

Pallenberg, who also modeled and designed clothing in the '60s, was long considered a muse for the Rolling Stones.

She dated guitarist Brian Jones for several years before leaving him for Richards in 1967.

Before splitting in 1980, the couple had three children together: Marlon, Angela and Tara, who died of Sudden Infant Death Syndrome in 1976.

Richards said in a statement that she was a "most remarkable woman."

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"Always in my heart," the rocker added.

Pallenberg also had roles in movies including "Barbarella" and "Candy."

She also worked with Mick Jagger in the 1970 movie "Performance." Rumors of a brief romance between the two circulated for years before she denied the rumors in 2007, when the DVD was released.

Pallenberg, shown here walking the runway at the Pam Hogg show during London Fashion Week in 2016, had roles in movies including “Performance,” “Barbarella” and “Candy.” (Eamonn M. McCormack/Getty Images)

Later in life, the actress graduated from Central Saint Martins in London with a degree in fashion design.

Pallenberg is survived by her two children, Marlon and Angela, and several grandchildren.

An exact cause of death was not revealed, but her rep said in a statement to the Daily News that she had been ill for some time.